Electronic atomization device

Abstract

The utility model discloses electronic atomization equipment, the electronic atomization equipment comprises a microwave generation unit used for generating microwave signals, the microwave generation unit comprises a reference frequency source, a phase-locked loop, a low-pass filter, a voltage-controlled oscillator and a feedback circuit, the phase-locked loop and the voltage-controlled oscillator are separately arranged, the reference frequency source outputs a reference frequency signal to the phase-locked loop, the phase-locked loop processes the reference frequency signal and a feedback signal to generate a control voltage, and the low-pass filter filters the control voltage and then outputs the control voltage to the voltage-controlled oscillator. The voltage-controlled oscillator outputs a microwave signal with a corresponding oscillation frequency according to the filtered control voltage, and the feedback circuit picks up a part of the microwave signal to generate a feedback signal and outputs the feedback signal to the phase-locked loop. According to the technical scheme, the cost is low, and the application flexibility is high.

Description

Technical Field

[0001] This utility model relates to the field of electronic atomization, and in particular to an electronic atomization device. Background Technology

[0002] In recent years, electronic atomization devices have developed rapidly. Heating methods for electronic atomization devices include resistance heating, coil heating, infrared heating, electromagnetic heating, and microwave heating. Among these, microwave heating requires a microwave generating unit to produce microwave signals, and the performance of the microwave generating unit directly determines the performance of the entire device. Therefore, the microwave generating unit is extremely important in electronic atomization devices.

[0003] However, it suffers from problems such as high integration, high cost, and limited flexibility. Utility Model Content

[0004] The technical problem to be solved by this application is to provide an electronic atomization device that addresses the technical shortcomings of existing technologies, such as high integration, high cost, and poor flexibility.

[0005] The technical solution adopted by this application to solve its technical problem is: constructing an electronic atomization device, including a microwave generation unit for generating microwave signals, wherein the microwave generation unit includes a reference frequency source, a phase-locked loop, a low-pass filter, a voltage-controlled oscillator, and a feedback circuit, and the phase-locked loop and the voltage-controlled oscillator are separately arranged, wherein...

[0006] The reference frequency source outputs a reference frequency signal to the phase-locked loop (PLL). The PLL generates a control voltage by processing the reference frequency signal and the feedback signal. The low-pass filter filters the control voltage and outputs it to the voltage-controlled oscillator (VCO). The VCO outputs a microwave signal with a corresponding oscillation frequency based on the filtered control voltage. The feedback circuit generates a feedback signal by picking up a portion of the microwave signal and outputs it to the PLL.

[0007] Preferably, it further includes a T-type attenuator for power adjustment, wherein the input terminal of the T-type attenuator is connected to the output terminal of the voltage-controlled oscillator, the output terminal of the T-type attenuator outputs a power-adjusted microwave signal, and the ground terminal of the T-type attenuator is connected to the input terminal of the feedback circuit.

[0008] Preferably, the reference frequency source is a temperature-compensated crystal oscillator.

[0009] Preferably, the low-pass filter is a passive low-pass filter; and / or,

[0010] The low-pass filter is an N-order low-pass filter, where N ≥ 3.

[0011] Preferably, the low-pass filter includes capacitors C1, C2, C3, and C4, and resistors R1, R2, and R3. The first terminals of capacitors C1, R2, and R1 are respectively connected to the output terminal of the phase-locked loop. The second terminal of capacitor C1 is grounded. The second terminal of resistor R2 is grounded through capacitor C2. The second terminal of resistor R1 is connected to the first terminals of capacitors C3 and R3 respectively. The second terminal of capacitor C3 is grounded. The second terminal of resistor R3 is connected to the input terminal of the voltage-controlled oscillator and the first terminal of capacitor C4 respectively. The second terminal of capacitor C4 is grounded.

[0012] Preferably, the voltage-controlled oscillator comprises:

[0013] A resonant module used to generate an oscillation signal with a corresponding oscillation frequency based on the filtered control voltage;

[0014] An amplification module for amplifying the oscillation signal;

[0015] Output matching module used for output matching processing of amplified oscillation signals.

[0016] Preferably, the resonant module is an inductor-capacitor parallel resonant module.

[0017] Preferably, the resonant module includes capacitor C13, capacitor C14, inductor L1, inductor L3, and varactor diode D1. The first end of inductor L3 and the first end of capacitor C14 are respectively connected to the output terminal of the low-pass filter. The second end of capacitor C14 is grounded. The second end of inductor L3 is connected to the first end of capacitor C13 and the cathode of varactor diode D1. The anode of varactor diode D1 is grounded through inductor L1. The second end of capacitor C13 is connected to the input terminal of the amplification module.

[0018] Preferably, the voltage-controlled oscillator further includes a constant current bias module for providing a constant current to the amplification module.

[0019] Preferably, the constant current bias module includes transistor T1, transistor T2, resistors R11, R12, and R13. The collector of transistor T1 is connected to the base of transistor T2, the collector of transistor T2 is connected to the power supply voltage, the collector of transistor T1 is connected to the power supply voltage through resistor R11, the emitter of transistor T1 is grounded, the emitter of transistor T2 is grounded through resistors R12 and R13 connected in series, and the connection point of resistors R12 and R13 is connected to the base of transistor T1.

[0020] The technical solution of this application provides that the microwave generating unit of the electronic atomization device adopts a closed-loop adaptive control method. The phase-locked loop (PLL) precisely adjusts the locking voltage (control voltage) of each node according to the frequency to be locked. The low-pass filter filters the locking voltage and sends it to the voltage-controlled oscillator (VCO). The VCO outputs a microwave signal of a precise frequency according to the locking voltage. Therefore, it is possible to quickly lock the frequency and output a microwave signal of the corresponding frequency. Moreover, since the PLL and the VCO are set separately, compared with the device integration scheme of the prior art, it is not only cheaper and more flexible in application, but also easier to install the microwave generating unit in the electronic atomization device. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a logic structure diagram of the microwave generating unit of an electronic atomizing device in one embodiment of this application;

[0023] Figure 2 This is a circuit diagram of the microwave generating unit of an electronic atomizing device in one embodiment of this application;

[0024] Figure 3 This is a circuit diagram of the voltage-controlled oscillator of the microwave generating unit in one embodiment of this application;

[0025] Figure 4 This is a circuit diagram of the constant current bias module in the voltage-controlled oscillator of the microwave generation unit in one embodiment of this application;

[0026] Figure 5 This is a test diagram of the frequency and power of the microwave generating unit of an electronic atomizing device in one embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] First, it should be noted that the electronic atomization device includes a microwave generating unit, a microwave heating unit, a control unit, a battery unit, etc., wherein the battery unit is used to provide power supply; the microwave generating unit is used to generate microwave signals of a specific frequency (e.g., 2.38 to 2.52 GHz); and the microwave heating unit is used to microwave heat the aerosol forming matrix by radiating microwave energy to the aerosol forming matrix under the control of the control unit.

[0029] Figure 1 This is a logic structure diagram of the microwave generating unit of an electronic atomizing device according to an embodiment of this application. The microwave generating unit of this embodiment includes a reference frequency source 11, a phase-locked loop 12, a low-pass filter 13, a voltage-controlled oscillator 14, and a feedback circuit 15. The phase-locked loop 12 and the voltage-controlled oscillator 14 are set separately. The output terminal of the reference frequency source 11 is connected to the first input terminal of the phase-locked loop 12, the output terminal of the phase-locked loop 12 is connected to the input terminal of the low-pass filter 13, the output terminal of the low-pass filter 13 is connected to the input terminal of the voltage-controlled oscillator 14, the input terminal of the feedback circuit 15 is connected to the output terminal of the voltage-controlled oscillator 14, and the output terminal of the feedback circuit 15 is connected to the second input terminal of the phase-locked loop 12. When the microwave generating unit is working, the reference frequency source 11 outputs a reference frequency signal to the phase-locked loop 12. The phase-locked loop 12 generates a control voltage by processing the reference frequency signal and the feedback signal. The low-pass filter 13 filters the control voltage and outputs it to the voltage-controlled oscillator 14. The voltage-controlled oscillator 14 outputs a microwave signal with the corresponding oscillation frequency according to the filtered control voltage. The feedback circuit 15 generates a feedback signal by picking up a part of the microwave signal and outputs it to the phase-locked loop 12.

[0030] In the technical solution of this embodiment, the microwave generating unit of the electronic atomization device adopts a closed-loop adaptive control method. The phase-locked loop precisely adjusts the locking voltage (control voltage) of each node according to the locking frequency. The low-pass filter filters the locking voltage and sends it to the voltage-controlled oscillator. The voltage-controlled oscillator outputs a microwave signal of a precise frequency according to the locking voltage. Therefore, it can realize the rapid locking of frequency and output a microwave signal of the corresponding frequency. Moreover, since the phase-locked loop and the voltage-controlled oscillator are set separately, compared with the device integration scheme of the prior art, it is not only lower in cost and more flexible in application, but also facilitates the installation of the microwave generating unit in the electronic atomization device.

[0031] Furthermore, in some embodiments of this application, the reference frequency source can be an active crystal oscillator or a passive crystal oscillator. The active or passive crystal oscillator can generate a stable frequency signal and provide a reference frequency signal to the phase-locked loop. This reference frequency signal is a sinusoidal signal with a certain signal amplitude and frequency characteristics. Additionally, a temperature-compensated crystal oscillator (TCXO) with good temperature characteristics is preferred as the reference frequency source.

[0032] Furthermore, in some embodiments of this application, the phase-locked loop includes a frequency and phase detector, a charge pump, etc. The frequency and phase detector can be an analog frequency and phase detector or a digital frequency and phase detector. The frequency and phase detector compares the feedback signal with a reference frequency signal. If the phase and frequency of the two signals are not equal, an adjustment signal is output; if the phase and frequency of the two signals are equal and the error is constant, the loop is in a locked state. The charge pump outputs a pump voltage (control voltage) based on the comparison result.

[0033] Furthermore, in some embodiments of this application, the low-pass filter can be an active filter or a passive filter, and a passive filter is preferred to avoid introducing nonlinear noise signals. Moreover, the low-pass filter is preferably an Nth-order (N≥3) low-pass filter. Regarding the order of the low-pass filter, it should be noted that although a higher order results in better noise performance, it also slows down the frequency lock-in time. Therefore, a 3rd-5th order low-pass filter is preferred.

[0034] Furthermore, in some embodiments of this application, the feedback circuit may include a frequency divider for dividing a portion of the microwave signal output by the voltage-controlled oscillator before sending it into the phase-locked loop.

[0035] Figure 2 This is a circuit diagram of the microwave generating unit of an electronic atomizing device according to an embodiment of this application. The microwave generating unit of this embodiment is compared to... Figure 1 The illustrated embodiment further includes a T-type attenuator 16 for power adjustment. The input of the T-type attenuator 16 is connected to the output of the voltage-controlled oscillator 14, and the output of the T-type attenuator 16 outputs a power-adjusted microwave signal. The ground terminal of the T-type attenuator 16 is connected to the input of the feedback circuit 15. In this embodiment, the T-type attenuator 16 adjusts the amplitude of the microwave signal with a constant frequency and amplitude output from the voltage-controlled oscillator 14 to control the power of the output microwave signal and the power of the feedback signal. Simultaneously, it can also isolate and match the preceding and following circuits.

[0036] Furthermore, such as Figure 2As shown, the low-pass filter 13 in this embodiment is a fourth-order passive low-pass filter, and includes capacitors C1, C2, C3, and C4, and resistors R1, R2, and R3. The first terminals of capacitors C1, R2, and R1 are connected to the output terminal of the phase-locked loop 12, respectively. The second terminal of capacitor C1 is grounded. The second terminal of resistor R2 is grounded through capacitor C2. The second terminal of resistor R1 is connected to the first terminals of capacitors C3 and R3, respectively. The second terminal of capacitor C3 is grounded. The second terminal of resistor R3 is connected to the input terminal of the voltage-controlled oscillator 14 and the first terminal of capacitor C4, respectively. The second terminal of capacitor C4 is grounded. In this embodiment, capacitor C1 constitutes a first-order filter; resistors R2 and C2 constitute a second-order filter; resistors R1 and C3 constitute a third-order filter; and resistors R3 and C4 constitute a fourth-order filter. The fourth-order passive low-pass filter in this embodiment has advantages such as good noise performance, wide bandwidth, and high reliability. Moreover, the steeper the transition band between low and high frequencies, the better the high-frequency suppression and the more ideal the amplitude-frequency characteristics.

[0037] Figure 3 This is a circuit diagram of a voltage-controlled oscillator (VCO) of a microwave generating unit in one embodiment of this application. The VCO of this embodiment includes a resonant module 141, an amplification module 142, and an output matching module (not shown). The resonant module 141 is used to generate an oscillation signal with a corresponding oscillation frequency according to the filtered control voltage. The amplification module 142 is used to amplify the oscillation signal. The output matching module is used to perform output matching processing on the amplified oscillation signal. The output matching module is, for example, a filter composed of passive components, used to filter out harmonic components in the oscillation signal and perform impedance matching.

[0038] like Figure 3 As shown, the resonant module 141 is an inductor-capacitor parallel resonant module, specifically including capacitor C13, capacitor C14, inductor L1, inductor L3, and varactor diode D1. The first terminals of inductor L3 and capacitor C14 are connected to the output of a low-pass filter, i.e., the control voltage (VT) output by the low-pass filter is applied. The second terminal of capacitor C14 is grounded. The second terminal of inductor L3 is connected to the first terminal of capacitor C13 and the cathode of varactor diode D1. The anode of varactor diode D1 is grounded through inductor L1. The second terminal of capacitor C13 is connected to the input of amplifier module 142. In this embodiment, when the external control voltage changes, the capacitance of varactor diode D1 changes accordingly, and the oscillation frequency changes. Therefore, intelligent adjustment of the oscillation frequency can be achieved according to the control voltage.

[0039] Furthermore, the amplifier module 142 preferably uses an amplifier chip with a Cascode structure (composed of two cascaded common-gate, common-source transistors), which can improve the performance and stability of the amplifier module. Moreover, as... Figure 3 As shown, the enable terminal of amplifier module 142 is connected to one end of filter capacitor C11 and decoupling capacitor C12, respectively, and the other ends of filter capacitor C11 and decoupling capacitor C12 are grounded. The power supply terminal of amplifier module 142 is connected to one end of filter capacitor C16 and decoupling capacitor C12 through choke inductor L4, and the other ends of filter capacitor C16 and decoupling capacitor C12 are grounded. The ground terminal of amplifier module 142 is grounded through choke inductor L2.

[0040] Furthermore, in an optional embodiment, the voltage-controlled oscillator (VCO) further includes a constant current bias module, which provides a constant current to the amplification module. Preferably, the constant current bias module can be integrated into the amplifier chip. In this embodiment, when the power supply voltage changes, by setting the constant current bias module, the quiescent current of the amplification module and the quiescent bias point of the internal transistors can remain unchanged. This ensures that the amplification module outputs a stable current that does not change with the power supply voltage, protects the oscillation frequency and amplitude-frequency characteristics within the operating bandwidth, and provides superior in-band power flatness, thus guaranteeing the stable performance of the VCO. Simultaneously, it reduces the load pulling effect, enabling the VCO to have higher output power and better output isolation.

[0041] Figure 4 This is a circuit diagram of the constant current bias module in the voltage-controlled oscillator of the microwave generation unit according to one embodiment of this application. The constant current bias module of this embodiment includes transistor T1, transistor T2, resistors R11, R12, R13, and R14, and capacitor C17. The collector of transistor T1 is connected to the base of transistor T2, and the connection point is connected to one end of capacitor C17, while the other end of capacitor C17 is grounded. The collector of transistor T2 is connected to the power supply voltage (Vcc), and the collector of transistor T1 is connected to the power supply voltage through resistor R11. The emitter of transistor T1 is grounded, and the emitter of transistor T2 is grounded through resistors R12 and R13 connected in series. The connection point of resistors R12 and R13 is connected to the base of transistor T1. The emitter of transistor T2 outputs a current signal Ib2 through resistor R14.

[0042] In the constant current bias module of this embodiment, when the power supply voltage (Vcc) increases, the base voltage of transistor T2 increases, and its emitter voltage also increases. The power supply voltage is divided in series by resistors R11, R12, and R13, causing the base voltage of transistor T1 to increase, thus increasing the collector current I3 flowing through transistor T1. According to Kirchhoff's laws, the base current I2 of transistor T2 decreases, thus decreasing the emitter current I1 flowing through transistor T2. This current I1 flows through resistors R12 and R13, therefore decreasing the emitter voltage of transistor T2. According to the principle of negative feedback, when the power supply voltage increases, the emitter voltage of transistor T2 remains essentially constant, thereby keeping the output current Ib2 essentially constant. Conversely, when the power supply voltage (Vcc) decreases, the emitter voltage of transistor T2 also remains essentially constant, thus keeping the output current Ib2 essentially constant. Therefore, the constant current bias circuit of this embodiment can generate a stable current that does not change with the power supply voltage.

[0043] Finally, the frequency and power of the microwave generating unit of this application were tested using a spectrum analyzer N9000B, and the test results are as follows. Figure 5 As shown in Table 1, the microwave generating unit can generate microwave signals with a center frequency of 2.38 to 2.52 GHz, and the power and power consumption of the generated microwave signals are consistent. Therefore, the microwave generating unit of this application has good electrical performance.

[0044]

[0045]

[0046] Table 1

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An electronic atomization device, comprising a microwave generating unit for generating microwave signals, characterized in that, The microwave generation unit includes a reference frequency source, a phase-locked loop (PLL), a low-pass filter, a voltage-controlled oscillator (VCO), and a feedback circuit. The PLL and the VCO are separately configured. The reference frequency source outputs a reference frequency signal to the phase-locked loop (PLL). The PLL generates a control voltage by processing the reference frequency signal and the feedback signal. The low-pass filter filters the control voltage and outputs it to the voltage-controlled oscillator (VCO). The VCO outputs a microwave signal with a corresponding oscillation frequency based on the filtered control voltage. The feedback circuit generates a feedback signal by picking up a portion of the microwave signal and outputs it to the PLL.

2. The electronic atomizing device according to claim 1, characterized in that, It also includes a T-type attenuator for power adjustment, wherein the input terminal of the T-type attenuator is connected to the output terminal of the voltage-controlled oscillator, the output terminal of the T-type attenuator outputs a power-adjusted microwave signal, and the ground terminal of the T-type attenuator is connected to the input terminal of the feedback circuit.

3. The electronic atomizing device according to claim 1, characterized in that, The reference frequency source is a temperature-compensated crystal oscillator.

4. The electronic atomizing device according to claim 1, characterized in that, The low-pass filter is a passive low-pass filter; and / or, The low-pass filter is an N-order low-pass filter, where N ≥ 3.

5. The electronic atomizing device according to claim 4, characterized in that, The low-pass filter includes capacitors C1, C2, C3, and C4, and resistors R1, R2, and R3. The first terminals of capacitors C1, R2, and R1 are connected to the output terminal of the phase-locked loop (PLL). The second terminal of capacitor C1 is grounded. The second terminal of resistor R2 is grounded through capacitor C2. The second terminal of resistor R1 is connected to the first terminals of capacitors C3 and R3, respectively. The second terminal of capacitor C3 is grounded. The second terminal of resistor R3 is connected to the input terminal of the voltage-controlled oscillator (VCO) and the first terminal of capacitor C4, respectively. The second terminal of capacitor C4 is grounded.

6. The electronic atomizing device according to any one of claims 1-5, characterized in that, The voltage-controlled oscillator includes: A resonant module used to generate an oscillation signal with a corresponding oscillation frequency based on the filtered control voltage; An amplification module for amplifying the oscillation signal; Output matching module used for output matching processing of amplified oscillation signals.

7. The electronic atomizing device according to claim 6, characterized in that, The resonant module is an inductor-capacitor parallel resonant module.

8. The electronic atomizing device according to claim 7, characterized in that, The resonant module includes capacitors C13 and C14, inductors L1 and L3, and varactor diode D1. The first end of inductor L3 and the first end of capacitor C14 are respectively connected to the output terminal of the low-pass filter. The second end of capacitor C14 is grounded. The second end of inductor L3 is connected to the first end of capacitor C13 and the cathode of varactor diode D1. The anode of varactor diode D1 is grounded through inductor L1. The second end of capacitor C13 is connected to the input terminal of the amplification module.

9. The electronic atomizing device according to claim 6, characterized in that, The voltage-controlled oscillator also includes a constant current bias module for providing a constant current to the amplification module.

10. The electronic atomizing device according to claim 9, characterized in that, The constant current bias module includes transistor T1, transistor T2, resistors R11, R12, and R13. The collector of transistor T1 is connected to the base of transistor T2. The collector of transistor T2 is connected to the power supply voltage. The collector of transistor T1 is connected to the power supply voltage through resistor R11. The emitter of transistor T1 is grounded. The emitter of transistor T2 is grounded through resistors R12 and R13 connected in series. The connection point of resistors R12 and R13 is connected to the base of transistor T1.

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